一种能有效消除水声信道相位连续旋转的分数间隔盲均衡算法研究  

A fractionally-spaced blind equalization algorithm for eliminating continuous phase rotation of underwater acoustic channel

作　　者：张银兵[1] 赵俊渭[1] 郭业才[2] 孙勇[1] 

机构地区：[1]西北工业大学航海学院,西安710072 [2]南京信息工程大学电子与信息工程学院,南京210044

出　　处：《声学学报》2010年第1期59-67,共9页Acta Acustica

基　　金：全国优秀博士学位论文作者专项基金(200753);国家自然科学基金(60372086)资助项目

摘　　要：针对信道均衡过程中的均衡器输出相位连续旋转问题,提出一种带有二阶数字锁相环的分数间隔超指数迭代盲均衡算法。该算法利用分数间隔超指数迭代算法加强对信道多途的抑制,利用二阶数字锁相环消除均衡器输出信号连续相位旋转,从而实现对原始发射信号的正确恢复。水池实验结果表明:该算法相对于常规盲均衡算法,收敛速度快,剩余均方误差小,能够有效地消除均衡器输出信号相位连续旋转,从而降低水声通信系统的误码率。To solve the problem of continuous phase rotation of the equalizer output during the process of channel equalization, a fractionally-spaced super-exponential iteration （FSSEI） algorithm with second order digital phase-locked loop （DPLL2） is proposed. The proposed algorithm realizes the transmitted sequence recovery by utilizing FSSEI algorithm to restrain the multi-path effect and using DPLL2 to eliminate continuous phase rotation of the equalizer output. The results of tank experiments show that the proposed algorithm has faster convergence speed and lower residual mean square error than several other blind equalization algorithms. It can solve the problem of continuous phase rotation and reduce bit error rate of underwater communication systems.

关 键 词：盲均衡算法 分数间隔 连续旋转 水声信道 相位旋转 数字锁相环 输出信号 迭代算法 

分 类 号：TN929.3[电子电信—通信与信息系统]